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Marker-assisted Feeding

Sometimes, getting to simple can be a very complicated process. Take, as an example, Cargill Cattle Feeders. In mid-2007, the cattle-feeding company began using DNA markers for marbling in their sorting criteria for feeder cattle. Simple, right? Well, yes and no. Just ask Bill Kolath. Kolath, a nutritionist and research scientist with Cargill Cattle Feeders in Dalhart, TX, oversees the company's use

Sometimes, getting to simple can be a very complicated process.

Take, as an example, Cargill Cattle Feeders. In mid-2007, the cattle-feeding company began using DNA markers for marbling in their sorting criteria for feeder cattle.

Simple, right? Well, yes and no. Just ask Bill Kolath.

Kolath, a nutritionist and research scientist with Cargill Cattle Feeders in Dalhart, TX, oversees the company's use of DNA marker-assisted selection to sort cattle. It's a joint development effort with MMI Genomics, Calverton, MD, that they started in late 2006 after finishing an extensive validation and development process that began around nine years ago. By 2007, they were testing the majority of the cattle fed in all five of their feedyards. By mid-2008, they were DNA testing 100% of the cattle in their four yards in Texas and Kansas and using the data to help sort cattle into four different outcome groups.

“It's been a learning experience to get the software where it is today,” Kolath says. “The decision is complex, but from a computing standpoint it's pretty simple.”

How it works

Newly arrived cattle are processed no differently than at any other feedyard, with a few notable exceptions. In addition to being dewormed, vaccinated, implanted and run through other standard processing procedures, the calves are individually weighed, a DNA sample is taken and each animal gets an EID tag. The animal's weight and DNA results are then linked to its individual identification number.

What doesn't happen at initial processing is any sorting. The calves are penned in chute-run fashion, usually as they come off the truck.

Where the big dance happens is at re-implant time which, based on the incoming weight of the cattle, is anywhere from 60 to 90 days after arrival. The incoming weight of the animal and its genetic potential for marbling, based on the DNA marker data, are already stored in the EID database. These data are combined with ultrasound data taken at the chute.

It all happens in real time, quickly and simply. As an animal enters the chute, a crew member reads the EID tag while another does the ultrasounding. A computer crunches the information and within seconds, a screen pops up that tells the crew into which of four outcome groups to sort the calf and what implant strategy to use — no implant, a mild dose or an aggressive approach.

The outcome groups are determined by the desired carcass endpoint, which is largely determined by days on feed. Group 1 is early-maturing animals that need fewer days on feed to reach the feedyard's carcass endpoint goals. Group 2 is average-type cattle. Group 3 is large-framed, late-maturing animals that need more time at the feedbunk, and Group 4 is genetically superior animals in terms of their ability to marble.

From there, the cattle are managed on a pen basis just like at any other feedyard. However, the data also help determine pen management decisions, including projected harvest dates and whether or not to use a beta agonist. “We haven't gone this far, but we could implement different rations to the different groups to maximize production efficiency,” Kolath says. That may yet come, as Cargill continues to look to technology to help it squeeze efficiency out of the feeding process.

What doesn't go into the equation is breed composition and frame score. “The measurements, along with the genetic information, won't tell us breed composition,” Kolath says. “But it will tell us how to manage that animal. The data drive the decision-making process.”

And having both the genetic data, as indicted by the DNA marker score, and an environmental measurement provided by ultrasound is necessary. “They go hand in hand,” he says. “You can have the best genetics in an animal, but if something in its history has messed it up, it's never going to get to that genetic potential.”

And in a bottom-line business like cattle feeding, genetic potential isn't as important as economic potential. Knowing the genetics, however, helps Cargill decide how to best take advantage of the economic potential.

“What we're really after is being able to optimize the capability of that animal. The animal may be able to meet a certain genetic potential, but from a production efficiency standpoint, it may not make sense for us to get there. So really, it's the economic capability of that animal.”

Combining genetic information with other measurable data simply allows Cargill Cattle Feeders to determine how best to manage each animal, grouped into outcome groups, to best optimize its economic potential. Kolath says almost any animal can perform in their management system.

Using as an example a large-framed, late-maturing animal with little genetic potential to grade Choice, he says while those animals won't work on a Choice grid, they can still work, assuming they can be identified. “Those cattle, in this management system, can perform. We can manage them accordingly and have some value at the end of the day. They're not necessarily a bad animal to have if you can manage them effectively.”

Next Page: Value is as value does

Value is as value does

So what's the value of heaping data upon data in an attempt to manage cattle? “I think the value is in consistency of product in terms of endpoint of the cattle. We don't have a lot of over-and under-finished cattle so it keeps us from having large amounts of discounted carcasses at the plant,” Kolath says.

Scott Nelson, manager of the Cargill Cattle Feeders yard at Dalhart, agrees. “Where we see the payback is on the price of a set of cattle sold on a grid,” he says. “All the way through the system, there's a lot more complexity for a feedlot to handle — how we sort, how we pen, how we handle cattle. But we are getting paid more on the grids for a consistent product into the plant.”

And the plant benefits from that as well. If they know they're getting a tightly consistent set of cattle, regardless of the type of cattle, they can more efficiently merchandise the product out the back door.

Kolath says Cargill's culture is to be customer-focused. “We believe that long-term profitability is driven by how well you can take care of your customers.” For Cargill Cattle Feeders, their customer is Excel. “But we take it a step further and really, our customers are Cargill Meat Solution's customers,” he says. “So because of this customer focus, we have a really intense focus on carcass endpoint. But at the same time, we've got to maintain production efficiency at least as well as the average feedlot producer in the industry.”

So how well are they doing? Cattle in Groups 1, 2 and 3 are all hitting industry averages for dressing percentage, backfat, ribeye area, yield grade and carcass grade. And Group 4 cattle, those identified with a strong genetic potential to marble, are hitting home runs with more than 80% grading Choice.

What's ahead?

Cargill has developed additional marker panels for average daily gain, ribeye area and tenderness. “We're looking at how to incorporate those into the sorting system,” Kolath says. “Those are going to be the next traits we could potentially add.” And as they not only push the technology forward to sort cattle into economically efficient outcome groups but trace it back through their buyers, they may be able to make purchasing decisions based on the history of the cattle.

Traditionally, Kolath says, feedyards managed cattle by focusing on the breed composition of the pen, on frame size as an indication of what the mature endpoint would be, and on body weight to determine days on feed. “But what's the genetic potential of those animals in the pen? It varies as much within each of those pens as when we look across our populations. This technology gives us the ability to look into those pens.”

TAGS: Genetics